Say's Law

例句：

1. 1. Thelaw of gravity dictates that objects falltowards the center of the Earth.
   万有引力定律告诉我们，物体会向地球的中心下落。
2. 2. This law is often applied toeconomics, where it explains why pricestend to increase over time.
   这个定律经常被应用于经济学中，它解释了为什么价格随着时间的推移往往会上升。
3. 3. The law of conservationof energy states that energy cannot be createdor destroyed, only transformed.
   能量守恒定律表明，能量既不能被创造也不能被销毁，只能被转化。